Earth Changes
The cold front, dubbed "Medea" after the mythical Greek sorceress of the Argonauts, sent temperatures plunging, with a maximum low of minus 19 degrees Celsius in the northwestern city of Florina.
"The last time we saw so much snow in the centre of Athens was in February 2008," meteorologist Costas Lagouvardos told AFP.
On the island of Evia near Athens, two elderly men suffering from respiratory problems died after their breathing apparatus failed during a power outage, state TV ERT reported.
On Crete, a livestock farmer in his 60s was found dead in the snow outside his granary at the village of Kaminaki in the east of the island, TV ERT added.

This photo of the Ocean Isle Beach area shows the destruction Tuesday morning following the potential tornado February 15, 2021
The massive winter storm that overwhelmed a Southwestern power grid and immobilized the Southern Plains was carrying heavy snow and freezing rain eastward, with bad weather spreading through into New England and the Deep South, the National Weather Service said.
The storm system left behind record-setting cold temperatures with wind-chill warnings extending from Canada into Mexico.
The Southwest Power Pool (SPP), which manages a 14-state grid from North Dakota to Oklahoma, on Tuesday ordered the second day of rolling blackouts, the news outlet reported.
SPP executive vice president and chief operating officer Lanny Nickell said in a statement that the move was a "last resort" and SPP had never before ordered such interruptions.
Comment: Check out Austin, Texas this week: it's covered in ice!
Mexico's government-owned utility, the Federal Electricity Commission (CFE), said on Monday its operations were interrupted as the winter storm in Texas froze natural gas pipelines.
Mexico uses gas to generate about 60 percent of its power, compared with about 40 percent in the United States, and the country built pipelines to take advantage of cheap natural gas from its northern neighbour.
A deep freeze across Texas during the weekend took a toll on the energy industry in the largest US crude-producing state, shutting oil refineries and forcing restrictions from natural gas pipeline operators.
A severe blizzard battered the northern island of Hokkaido on Tuesday and a storm surge inundated homes in part of the island, according to the Hokkaido Shimbun newspaper.
A gust of 162km/h was recorded at Cape Erimo on Hokkaido and 135 km/h in the city of Sakata, Yamagata prefecture.
The Japan Meteorological Agency warned of "the most powerful blizzard in years," which could produce white-out conditions, for part of the island through Wednesday.
In a video provided by RT's Ruptly video agency, dark orange lava can be seen shooting out of the top of Mount Etna and dripping down its sides.
According to the National Institute of Geophysics and Volcanology, which observes the volcano, the eruption came from the south east crater, with activity from the other craters, too.
But perhaps nothing was as terrifying as seeing the word "Snownado" come across my Twitter timeline.
In the East Texas town of Gun Barrell City witnesses recorded what looked like a tornado in the middle of the blizzard. The now-dubbed "Snownado" swirled above Cedar Creek Lake for a bit before dissipating.
Here is a video capturing the event that was thankfully uploaded to the Internet:

This image provided by Colorado Avalanche Information Center shows an avalanche that killed an unidentified snowboarder on Sunday, Feb. 14, 2021, near the town of Winter Park in Colorado.
At least 25 people have been killed in avalanches in the United States this year — more than the 23 who died last winter. Typically, 27 people die in avalanches in the U.S. annually.
Avalanche forecasters say they have rarely seen the danger as high as it is now — and it will grow as more snow moves into the Rockies, adding weight and stress on a weak, granular base layer of snow that's susceptible to breaking apart and triggering especially wide slides on steep slopes.
According to police, the accident took place in Firoza's Chak 239.
The police said the children were playing when a landslide struck. They died on the spot. Their bodies have been shifted to a hospital.
The deceased were aged between three and eight years, the law enforcers said.
Comment: Cold front Medea brings snow to northern Greece